JPH0481405B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an agricultural machine coupling device, and relates to a device for coupling a working machine to a tractor and for transmitting output from the tractor to the working machine.

(Prior Art) Conventionally, as this type of coupling device, for example,
As described in U.S. Pat. No. 4,090,725, when connecting the four-point connecting portion on the connecting frame side provided on the tractor and the four-point connecting portion on the working machine side,
The left and right hitch fittings on the connecting frame side and the left and right connecting rods on the working machine side are connected to each other, and the connecting shaft part on the connecting frame side and the input shaft on the working machine side are connected to each other from the front and back directions, and the upper part of the connecting frame side is connected to each other from the front and back directions. A configuration is known in which the hitch metal fitting is rotated and connected to the upper connecting rod on the work equipment side, but in this configuration, the 4-point connection part on the connection frame side and the 4-point connection part on the work equipment side are omitted. They cannot be connected at the same time, and the 3-point connection on the connection frame side and the 3-point connection on the work equipment side are connected from the front and back, so when connecting in the field, the tractor and work equipment must be connected separately. Since it sinks depending on the weight, there is a problem in that it takes a lot of effort to align these three-point joints.

Therefore, hitch metal fittings with open bottoms are installed on the upper and lower left and right sides of the front side of the work equipment, and the input shaft is installed on the connecting frame connected to the suspension mechanism of the tractor. Connecting rods are provided protruding from the upper and lower left and right parts of the front side part to engage with each of the hitch fittings, and a power relay shaft that connects the power transmission shaft that transmits the power of the tractor to this connection frame is rotatable. When the connecting frame is raised and rotated by the suspension mechanism of the tractor, the upper and lower connecting rods of this connecting frame are engaged with the upper and lower hitch fittings of the work equipment, and the power relay is There is one that connects the shaft to the input shaft of the work machine.

(Problems to be Solved by the Invention) In the above-mentioned conventional configuration, the arc movement of the suspension mechanism of the tractor allows the four-point connection on the connection frame side connected to the tractor and the four-point connection on the work machine side to However, in this case, since the power relay shaft is not variably adjustable attached to the connection frame, the input shaft of a particular work machine is connected to the other three-point connection parts. However, depending on the type of work equipment, the position of the input shaft is different, and there is often a shift in the vertical and horizontal directions, and in such cases, the power relay shaft and input shaft There is a problem in that it cannot be connected together with other three-point connecting parts and lacks versatility.

In addition, in the above conventional configuration, the connecting frame has
Because the power relay shaft for connecting the power transmission shaft that transmits the power of the tractor to the input shaft is supported, the length of the power transmission shaft is shortened by this power relay shaft, and the bending angle of the power transmission shaft is increased. , there is a problem that abnormal noise may be generated due to non-uniform speed rotation.

Therefore, the present invention has been made in view of the above points, and includes a connecting shaft portion of a power transmission shaft that is attached to a connecting frame so that its position can be adjusted, and this connecting shaft portion is set to correspond to the input shaft of various working machines. This connection shaft and the input shaft of the desired work machine can be connected together with other three-point connections, increasing versatility. To provide an agricultural machine coupling device which directly supports the parts and does not use a conventional power relay shaft, so that the bending angle of the power transmission shaft does not become large and does not generate abnormal noise due to non-uniform rotation. The purpose is to

(Means for Solving the Problems) The agricultural machine coupling device of the present invention has an input shaft that is provided with inverted U-shaped hitch fittings on both sides of the upper and lower parts of the front side, and has an inverted U-shaped coupling fitting on the front side. a working machine, a connecting frame that is connected to the suspension mechanism of the tractor and has connecting rods on both upper and lower sides that are connected to each of the hitch fittings of the working machine, and one end of which is freely connected to the output shaft of the tractor; a power transmission shaft that is connected via a joint and has a connecting shaft provided at the other end via a universal joint and rotatably supported by the connecting frame via a bearing body;
Each connecting rod of the connecting frame, which is rotated upward by the suspension mechanism of the tractor, is connected from below to each hitch fitting of the working machine, and the power transmission shaft supported by the connecting frame is connected from below. In an agricultural machine coupling device that connects a coupling shaft portion to a coupling fitting of the input shaft from below, a support plate is fixed to the coupling frame, and an outer peripheral portion of the bearing body is inclined with respect to a direction orthogonal to the coupling shaft portion. the flange of the bearing body is attached to the support plate so as to be adjustable in position around the connection shaft, and the connection shaft is engaged with the connection fitting of the input shaft from below using the bearing body. It is set in the position.

(Function) In the agricultural machine coupling device of the present invention, a coupling frame is coupled to a suspension mechanism of a tractor, and one end of a power transmission shaft with a coupling shaft supported by the coupling frame is coupled to an output shaft of the tractor.

When the connecting frame is raised and rotated by the suspension mechanism of the tractor, the upper, lower, left, and right connecting rods of the connecting frame are connected from below to the upper, lower, left, and right hitch fittings of the work equipment, and bearings are attached to the connecting frame. The connecting shaft portion of the power transmission shaft supported through the connecting shaft is connected from below to the connecting fitting of the input shaft of the working machine. By connecting the 4-point connection part on the connection frame side and the 4-point connection part on the work equipment side, that is, by directly connecting the connection shaft part of the power transmission shaft to the input shaft, the power transmission shaft can be bent at a small bending angle. It is connected between a tractor and a working machine, and the output from the tractor is transmitted to the input shaft of the working machine via a power transmission shaft.

When connecting the link shaft of the power transmission shaft and the input shaft, the link shaft of the power transmission shaft may be misaligned in the vertical and horizontal directions with respect to the input shaft, causing the connection fitting of the input shaft to be connected from below. When the connection is impossible or difficult, the bearing body is rotated about the connection shaft along the support plate fixed to the connection frame in a longitudinally inclined state, and the bearing body is used to rotate the connection shaft. Set it in the position corresponding to the input shaft connection fitting. Therefore, by setting the connecting shaft of the power transmission shaft to a position where it can be connected from below to the input shaft of various types of work equipment, the four-point connection on the connection frame side and the four-point connection on the work equipment side can be established. The parts can be connected substantially simultaneously.

(Example) Hereinafter, an example of the present invention will be described with reference to the accompanying drawings.

In the figure, reference numeral 1 designates a connecting frame bent into a mountain shape. Approximately triangular guide plates 2, which also serve as connecting plates, are integrally attached to the lower portions of both left and right sides of the connecting frame 1. Attachment holes 3 are formed in the front lower part of the guide plate 2 as connecting portions for attaching lower pins that detachably connect left and right lower links A as suspension mechanisms of the tractor. Furthermore, connecting rods 6 are provided on the outside of the rear lower portions of the guide plates 2 on both sides to removably connect lower hitch fittings 5 as inverted U-shaped hitch fittings protruding from the front part of the working machine 4. It is installed horizontally.

The lower hitch fittings 5 on both sides are fixed to the tips of connecting arms 7 that protrude forward from lower sides on both sides of the working machine 4. The lower hitch fittings 5 on both sides are formed into a substantially inverted U-shape with their lower surfaces open, and hold the connecting rod 6 in the curved connecting portion between the front piece 8 and the rear piece 9. Holding part 10
An engagement guide piece 11 is integrally formed below the rear piece 9 and extends downwardly from the lower edge of the front piece 8. A guide hole 12 that is long in the direction is bored. Further, a mounting bar 14 is installed horizontally between the mounting piece 13 bored in the upper part of the lower hitch fitting 5 on both sides and the connecting arm 7, and a release lever 15 is mounted on the mounting bar 14 on both sides. It is movably attached, and the release levers 1 on both sides of this
A substantially C-shaped lock arm 16 is integrally formed at the bottom of each of the lock arms 16, and arc-shaped locking portions 17 formed at the lower ends of the lock arms 16 on both sides extend from the respective guide holes 12 to the above-mentioned holder. The release levers 15 on both sides are provided in the opening of the holding portion 10 so as to be freely retractable.
They are each removably locked by a stopper 18 attached to.

Further, the coil spring 19 wound around the mounting rods 14 on both sides is locked at one end to the release lever 15 and at the other end to the connection arm 7, respectively. By means of the coil springs 19 on both sides, each lock arm 16 is
are always energized, and their locking portions 17 project from the guide holes 12 into the openings of the holding portions 10, respectively, and lock the connecting rods 6 inserted from below into the respective holding portions 10 from below. I'm starting to do that.

The lower links B on both sides are pivoted up and down in an arc around a pivot point by a hydraulic drive mechanism of the tractor.

Next, a pair of connecting plates 21 are integrally protruded from the intermediate upper part, that is, the top part 20 of the connecting frame 1 in a left-right parallel manner, and between this pair and the upper and lower parts of the connecting plates 21, a suspension mechanism for the tractor is formed. A connecting pin 22 serving as a connecting portion for removably connecting the top link B is suspended horizontally through a mounting hole 23. Further, a pair of guide plates 24 are integrally provided on the rear side of the pair of connecting plates 21 and project in parallel to each other,
A connecting rod 26 removably connects an upper hitch fitting 25 as an inverted U-shaped hitch fitting protruding from the front part of the working machine 4 between the pair of guide plates 24.
is suspended horizontally. The upper hitch fitting 25 is
It is fixed to the tip of a connecting arm 27 that projects forward from the upper center of the working machine 4.

The upper hitch metal fitting 25 is formed into a substantially inverted U shape with its lower side open, and has a holder that holds the connecting rod 26 in a curved connecting portion between the front piece 28 and the rear piece 29. 30 is formed, and an engagement guide piece 31 is integrally formed below the rear piece 29 and protrudes downward from the lower end edge of the front piece 28.

Further, a mounting plate 32 is integrally fixed to the lower part of the top portion 20 of the connection frame 1.
The front end of the horizontal portion 34 of the suspender 33, which is formed into a substantially L-shape when viewed from the side, is removably fixed with a plurality of bolts and nuts 36 via a locking plate 35. An annular support plate 38 is integrally fixed to the lower end of the vertical portion 37 of 33 by welding or the like. That is, the support plate 38 has an upper side facing rearward in the front-rear direction and a lower side facing backward in the front-rear direction. The support plate 38 is integrally fixed to the support plate 38 while being inclined at a predetermined inclination angle toward the front, and a plurality of attachment holes are formed at intervals at the peripheral edge of the insertion hole of the support plate 38.

Further, a bearing body 39 is rotatably fitted into an insertion hole formed in the center of the support plate 38, and
A power transmission shaft 4, which will be described later, is attached to the outer circumference of this bearing body 39.
An annular flange 40 is formed that is inclined with respect to a direction perpendicular to the connecting shaft portion 44 of No. 3, and a plurality of mounting holes are formed at the peripheral edge of the flange 40, each communicating with each of the mounting holes of the support plate 38. ing.
The flange 40 of the bearing body 39 is superimposed on the peripheral edge of the insertion hole of the support plate 38 so as to be freely adjustable in position by rotation about the connection shaft 44, and the flange 40 is positioned at a set position with respect to the support plate 38. are connected by a plurality of bolts and nuts 41 inserted through a plurality of facing and communicating mounting holes, and a power transmission shaft 43 (described later) is connected to the bearing body 39.
The connecting shaft portion 44 is set at a position where it engages from below with a connecting fitting 56 of an input shaft 53 of the working machine 4, which will be described later.

Further, a substantially intermediate portion of the connecting shaft portion 44 of the power transmission shaft 43 is rotatably supported within the bearing body 39 via a bearing 42 . This power transmission shaft 43
has an inner tube 45 and an outer tube 46 that are fitted into each other, and the inner tube 45 and the outer tube 46 have cross-sectional shapes that are mutually expandable and contractible in the longitudinal direction and fixed in the axial direction, for example. The inner cylinder 45 has an egg-shaped or spline-shaped cross section, and a yoke 48 connected to the output shaft C of the tractor via a universal joint 47 is connected to the outer end of the inner cylinder 45. The connecting shaft section 44 is connected to the connecting shaft section 44 via a universal joint 49, and the connecting shaft section 44 has a connecting section 51 having an engaging surface 50 formed by vertically cutting out both side surfaces at the leading end of the connecting shaft section 44.
is formed.

Next, the working machine 4 is provided with a transmission 52, and the input shaft 53 is rotatably protruded forward from the transmission 52.
A flat locking part 55 having a cutout surface 54 with both side surfaces cut out is formed at the tip of the locking part 55, and the locking part 55 has a rear side of the interlocking fitting 56, which is approximately inverted U-shaped and has an open bottom surface. The parts are fitted and fixed together. A locking recess 5 is provided on the front side of the interlocking fitting 56.
7 is formed in this locking recess 57, and a connecting portion 51 at the tip of the connecting shaft portion 44 of the power transmission shaft 43 is removably engaged from below, thereby preventing their mutual engagement. At times, the connecting shaft portion 44 and the input shaft 53 are rotated together as a unit via the interlocking fitting 56.

The transmission 52 is provided at an intermediate portion of a main body frame 58 of the working machine 4. Further, a chain case 59 and an upper part of a bracket facing each other are integrally fixed to both ends of the main body frame 58, and a rotary work body 60 is disposed between the chain case 59 and the lower end of the bracket via its tilling shaft 61. It is rotatably supported. The rotary work body 60 is operatively connected to the transmission 52 via an interlocking medium consisting of its output shaft and a chain in the chain case 59. In addition, in the figure, 62 is a cover body that covers the upper part of the rotary work body 60, and 63 is a flat plate that is provided to be vertically movable.

Next, the operation of the above embodiment will be explained.

The lower pins fixed in the mounting holes 3 at the bottom of both sides of the connecting frame 1 are rotatably connected to the tips of the left and right lower links A of the tractor, and the upper part of the connecting frame 1 is connected to the tips of the top links B of the tractor. The plates 21 are rotatably connected via a connecting pin 22. In addition, a connecting shaft portion 4 is attached to the connecting frame 1.
A yoke 48 at one end of a power transmission shaft 43 that rotatably supports a motor 4 is connected to an output shaft C of a tractor.

As a result, the connecting frame 1 is connected and supported by the three-point suspension mechanisms A and B of the tractor, and the power transmission shaft 43 is rotatably connected between the output shaft C of the tractor and the connecting frame 1. The connecting shaft portion 44 at the other end of the power transmission shaft 43 is directly rotatably suspended from a bearing body 39 provided on the support plate 38 of the connecting frame 1 via a suspension 33. Universal joints 47 at both ends of the transmission shaft 43,
Since the distance L between the cross pins 47a and 49a at 49 is longer than that in the conventional configuration in which a power relay shaft is interposed, the bending angle β of the power transmission shaft 43 is small.

Next, when the tractor is moved backward toward the work equipment 4 with the connecting frame 1 lowered by the three-point suspension mechanism of the tractor in accordance with the upper hitch metal fitting 25 and the lower hitch metal fitting 5 of the work equipment 4, the connecting frame 1 The lower connecting rods 6 on both sides of the work equipment 4 contact the engagement guide pieces 11 of the lower hit fittings 5 on both sides of the working machine 4, and the upper connecting rods 26 contact the engaging guide pieces 11 of the upper hit fittings 25 of the working machine 4. 31 or
Or upper hitch metal fitting 25 and lower hitch metal fitting 5
The connecting rods 6, 26 of the connecting frame 1 are arranged at the lower part of the connecting frame 1. Then, the hydraulic drive mechanism of the tractor is activated to move the top link B and the lower links A on both sides.
When the connecting frame 1 is rotated upwardly around a rotational fulcrum provided on the tractor side, the connecting frame 1 is upwardly rotated in an arc shape, and the connecting rods 6 at the bottom of both sides are guided by the engagement guide pieces 11 from below. While being engaged into the holding part 10, the upper connecting rod 26 of the connection frame 1 is guided by the engagement guide piece 31 and engaged into the holding part 30 from below. At this time, the locking portions 17 of the lock arm 16, which are biased by the coil springs 19, are protruded into the lower hitch fittings 5 on both sides so that they can come out and retract freely, so the locking portions 17
When the connecting rod 6 is pulled up from below, the connecting rod 6 moves up while pushing back the locking portion 17, so that the connecting rod 6 passes through the locking portion 17, and the locking portion 17 is connected to the coil. The holding portion 10 is automatically rotated back by the return force of the spring 19.
The connecting rod 6 is protruded from the lower part of the connecting rod 6 that is engaged therein, and the connecting rod 6 is locked by the locking portion 17 .

Also, at approximately the same time as the connection rods 6 and 26 are engaged with the upper and lower hitch fittings 5 and 25, the connection portion 51 at the tip of the connection shaft portion 44 of the power transmission shaft 43 supported on the connection frame 1 is connected to the input shaft 53. They are engaged from below in the locking recess 57 of the interlocking fitting 56, and are integrally integrated with each other in the rotational direction. By connecting the four-point connection part on the side of the connection frame 1 and the four-point connection part on the work machine 4 side, that is, by directly connecting the connection shaft part 44 of the power transmission shaft 43 to the input shaft 53, the power transmission shaft 43 is connected between the tractor and the working machine 4 at a small bending angle, and the output from the tractor is transmitted to the working machine 4 via the power transmission shaft 43.
The signal is transmitted to the input shaft 53 of.

The connecting shaft portion 44 of the power transmission shaft 43 and the input shaft 5
3, the connection shaft portion 44 of the power transmission shaft 43 is misaligned in the vertical and horizontal directions with respect to the input shaft 53, making it impossible or difficult to connect the input shaft 53 to the connection fitting 56 from below. When the bearing body 39 is in a state of
At the same time as removing the nut 41, the flange 40 of the bearing body 39 is rotated around the connecting shaft portion 44 along the fixing support plate 38 via the suspender 33 to the connecting frame 1, and the body is attached to the support plate 38. bearing body 39
The connecting shaft portion 44 of the bearing body 39 is set in a position where it engages with the connecting fitting 56 of the input shaft 53 from below, and the flange 40 of this bearing body 39 is again overlapped with the support plate 38. In this state, they are connected using a plurality of bolts and nuts 41 inserted through a plurality of opposing and communicating mounting holes. Therefore, by setting the connecting shaft portion 44 of the power transmission shaft 43 to a position where it engages with the input shaft 53 of various working machines 4 from below, it is possible to connect the four-point connecting portion on the connecting frame 1 side and work with it. The four-point connection part on the machine 4 side can be linked almost simultaneously.

Then, the work equipment 4 is towed by the tractor, and the input shaft 53 is rotated in conjunction with the power transmission shaft 43 connected to the output shaft C of the tractor, and the rotary work body 60 is driven by the transmission 52 via the interlocking medium. Drive rotation. As a result, the rotary work body 60 performs desired agricultural work such as tilling and crushing soil on the field.

〔Effect of the invention〕

According to the present invention, the upper and lower connecting rods of the connecting frame, which is rotated upwardly by the suspension mechanism of the tractor, are connected to the upper and lower hitch fittings of the working machine, respectively, and the connecting rods are connected to the connecting frame through the bearing body. In a device in which a connecting shaft portion of a rotatably supported power transmission shaft is connected from below to a connecting fitting of an input shaft of a working machine, a support plate is fixed to the connecting frame, and the connecting shaft portion is attached to the outer periphery of the bearing body. The flange of the bearing body is attached to the support plate so as to be adjustable in position with respect to the linking shaft, and this bearing body connects the linking shaft to the input shaft. Since it is set in a position where it engages with the connecting fitting from above, by adjusting the position of the flange of the bearing body on the support plate and attaching it around the connecting shaft part, the power transmission shaft supported by this bearing body can be adjusted. The connecting shaft can be set in a state where it can be reliably engaged from below with the inverted U-shaped connecting fittings of the input shafts of various types of work equipment, and power can be transmitted to the connecting fittings of the input shafts of various types of working machines. It is possible to reliably prevent a situation in which the connection shaft part of the shaft becomes difficult to connect from below due to positional deviation, and therefore, the power transmission shaft can be connected by upward rotation due to the circular motion of the suspension mechanism of the tractor. The shaft portion and the input shaft of a desired working machine can be reliably linked together with other three-point connecting portions, and the setting position of the connecting shaft portion of the power transmission shaft supported on the connecting frame can be variably adjusted. Since various working machines can be connected, the versatility of the connection frame can be increased. In addition, since the connecting shaft part of the power transmitting shaft is directly rotatably supported on the connecting frame and a conventional power relay shaft is not used, the bending angle of the power transmitting shaft does not become large, and abnormal noise due to non-uniform rotation is avoided. can be reliably prevented from occurring.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, and Fig. 1 is a side view of the agricultural machine and the coupling device connected together, Fig. 2 is a sectional view of the above coupling device, and Fig. 3 is an exploded perspective view of the same. be. 1...Connection frame, 4...Working machine, 5, 25
...Hitsuchi metal fittings, 6, 26...Connection rod, 38...
Support plate, 39... bearing body, 40... flange, 4
3...Power transmission shaft, 44...Connection shaft portion, 47, 4
9...Universal joint, 53...Input shaft, 56...Connection fittings, A...Lower link, B...Top link.

Claims (1)

[Scope of Claims] 1. A work machine provided with inverted U-shaped hitch fittings on both upper and lower sides of the front side, and an input shaft with an inverted U-shaped connecting fitting on the front side;
a connecting frame that is connected to the suspension mechanism of the tractor and has connecting rods on both upper and lower sides that are connected to each of the hitch fittings of the working machine; and one end is connected to the output shaft of the tractor via a universal joint. It consists of a power transmission shaft in which a connecting shaft part provided at the other end via a universal joint is rotatably supported by the connecting frame via a bearing body, and the power transmission shaft is rotated upwardly by the suspension mechanism of the tractor. Agricultural work in which each connecting rod of the connecting frame is connected from below to each hitch fitting of the working machine, and the connecting shaft portion of the power transmission shaft supported by the connecting frame is connected from below to the connecting fitting of the input shaft. In the machine coupling device, the coupling frame support plate is fixed, a flange inclined with respect to a direction perpendicular to the coupling shaft is formed on the outer circumference of the bearing body, and the flange of the bearing body is fixed to the support plate. 1. An agricultural machine coupling device, characterized in that the coupling shaft is mounted so as to be adjustable in position around the coupling shaft, and the coupling shaft is set at a position where the coupling shaft engages the coupling fitting of the input shaft from below using the bearing body.